Have fun and giggles until the Autumn, by which time full details of the events for next year will be out and you can plan in earnest. Mal Volio's post laid out the basics so I won't repeat them. I'd only add not to worry too much about "training", as there isn't really specific training for audax. It's more about learning what works for you on ever longer rides, particularly when you do events that stretch into darkness (which will generally be 200s over the winter, 300s in the spring/autumn and 400+ in the summer) and in rotten weather conditions.
The joy of audax is that there are challenges that can be tailored to everyone's preferences; be it a local SR series, travelling to events around the country or even overseas. This forum has reports on most of the UK rides - you'll soon pick up that events such as the Elenith, Irish Mail, Bryan Chapman, Kernow and South West, Dean, Brevet Cymru, Severn Across, Three Coasts (and many others) have loyal followings. That's not to say they are the best, but they are probably ones that you won't go far wrong with if you do them.
And don't discount the lure of the UK's premier event, London-Edinburgh-London, in 2013...